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Chemical Changes and Electrolysis

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Questions and Answers

Why is tin used in tin cans for storing food?

Tin is a better conductor of electricity than iron.

Tin is less reactive than iron. (correct)

Tin is more reactive than iron.

Tin is cheaper than iron.

Why is zinc coated on iron in bridges and automobiles?

To make it look shiny.

To prevent it from coming in contact with water.

To increase its weight.

To protect it from corrosion and rust. (correct)

What are the chemical effects produced when an electric current passes through a conducting liquid?

Change in color.

Formation of bubbles.

Increase in temperature.

Chemical reactions. (correct)

Why is the disposal of used conducting solution a major concern in electroplating factories?

To prevent environmental pollution. Signup and view all the answers

What do most liquids that conduct electricity contain?

Acids and bases. Signup and view all the answers

What is the process called when a layer of metal is deposited on another material using electricity?

Electroplating Signup and view all the answers

What happens when electrodes are immersed in water and a current is passed through?

Bubbles of oxygen and hydrogen are produced Signup and view all the answers

How can the chemical change taking place in the solution be described?

Chemical change Signup and view all the answers

What happens to the electrodes when an electric current passes through a conducting solution?

Deposits of metal may be seen on electrodes Signup and view all the answers

What did William Nicholson's experiment with water and electrodes demonstrate?

Formation of oxygen and hydrogen bubbles Signup and view all the answers

What can cause changes of color in solutions when an electric current passes through?

Chemical reactions induced by the current Signup and view all the answers

What did Boojho observe when he inserted copper wires into a potato and left them for half an hour?

A greenish blue spot around one wire only Signup and view all the answers

Why is it dangerous to touch an electrical appliance with wet hands?

Wet hands can cause a short circuit Signup and view all the answers

What type of materials are good conductors of electricity?

Materials that allow electric current to pass through easily Signup and view all the answers

What did the tester help determine about materials in Class VI?

Whether a material conducts electricity or not Signup and view all the answers

Which materials conduct electricity according to the text?

Copper and aluminium Signup and view all the answers

What caution is provided by Paheli and Boojho when experimenting with electricity?

Use electric cells instead of mains power Signup and view all the answers

Why should one not experiment with electric supply from mains, generator, or inverter?

It is safer to use electric cells for such activities Signup and view all the answers